function show_img_by_name(){
    // let img_name_input = document.getElementById('img_name');
    // let img_name = img_name_input.value;
    // console.log('you input img_name:' + img_name);
    // let img_node = document.getElementById('img_id');
    // img_node.src = 'static/img/' + img_name;
    vm.$data.img_url_data = 'static/img/a0.jfif';
};